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What are you talking about?
Actually, the mask they wear is a rebreather. They breathe methane, so they have to wear it to survive in the not-so-methane-rich atmosphere.
He's talking about the rebreather on Grunts.
mabe it's more like a muzle to keep them from biteing other aliens, or doing something else that envolves them usesing there mouths. after all they do seem a little more emothinal than the other aleins.